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Which of the following item must fall within the prescribed limit for ring gauges?

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Which of the following item must fall within the prescribed limit for ring gauges?

(a) Measured effective diameter  +ΔE1+ΔE2

(b) Measured effective diameter  +ΔE1-ΔE2

(c) Measured effective diameter  -ΔE1-ΔE2

(d) Measured effective diameter  -ΔE1+ΔE2

This question was posed to me in unit test.

My query is from Screw Thread Gauge Tolerance topic in section Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

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Right option is (c) Measured effective diameter  -ΔE1-ΔE2

The best I can explain: For ring gauges, requirements that must met are the measured effective diameter along the pitch line and the measured effective diameter -ΔE1-ΔE2. It should be noted that the max. allowable pitch error or the max. allowable angle error can readily be found from the formulae given, by evaluating ΔE1or ΔE2 to the full effective diameter tolerance allowed on any given size of gauge.

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